ctf.view
Class Double_buffered_canvas

java.lang.Object
  java.awt.Component
      java.awt.Canvas
          ctf.view.Double_buffered_canvas

All Implemented Interfaces:

java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable, javax.accessibility.Accessible

Direct Known Subclasses:

FieldView

abstract class Double_buffered_canvas
extends java.awt.Canvas

Implement double buffering. Thanks to MPBL.

Parts of this file are COPYRIGHT (C) 1999 by Michael Bruce-Lockhart.

Other parts are COPYRIGHT (C) 1999 by Theodore S. Norvell.

The associated software is released to students for educational purposes only and only for the duration of the course in which it is handed out. No other use of the software, either commercial or non-commercial, may be made without the express permission of the authors.

Nested Class Summary

Nested classes/interfaces inherited from class java.awt.Canvas

java.awt.Canvas.AccessibleAWTCanvas

Nested classes/interfaces inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent, java.awt.Component.BaselineResizeBehavior, java.awt.Component.BltBufferStrategy, java.awt.Component.FlipBufferStrategy

Field Summary

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Double_buffered_canvas()

Method Summary

protected abstract void	draw_canvas(java.awt.Graphics g)
void	finalize() Overloaded from java.lang.Object, disposes of offscreen graphics
void	paint(java.awt.Graphics screen) Unless a redraw has been triggered paint simply brings forward the existing offscreen image
void	refresh() Refresh the view.
void	setBounds(int x, int y, int w, int h) All component shaping operations call setBounds().
void	update(java.awt.Graphics screen) Double-buffered update first draws the required graphics offcreen, then copies them forward to the screen.

Methods inherited from class java.awt.Canvas

addNotify, createBufferStrategy, createBufferStrategy, getAccessibleContext, getBufferStrategy

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getAlignmentX, getAlignmentY, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, paramString, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, processComponentEvent, processEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, setBackground, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, validate

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Double_buffered_canvas

Double_buffered_canvas()

Method Detail

draw_canvas

protected abstract void draw_canvas(java.awt.Graphics g)

refresh

public void refresh()

Refresh the view. Calling this method will cause the view to be updated to reflect the current state of the game. You should either call this whenever a change is made to the game state (e.g. something moves).

update

public void update(java.awt.Graphics screen)

Double-buffered update first draws the required graphics offcreen, then copies them forward to the screen.

Overrides:

update in class java.awt.Canvas

Parameters:

screen - Graphics object to update

paint

public void paint(java.awt.Graphics screen)

Unless a redraw has been triggered paint simply brings forward the existing offscreen image

Overrides:

paint in class java.awt.Canvas

Parameters:

screen - Graphics object to update

setBounds

public void setBounds(int x,
                      int y,
                      int w,
                      int h)

All component shaping operations call setBounds(). Overloaded from java.awt.Canvas function so that a repaint() is triggered.

Overrides:

setBounds in class java.awt.Component

Parameters:

x - Top left corner x-cordinate

y - Top left corner y-coordinate

w - Width of component

h - Height of component

finalize

public void finalize()

Overloaded from java.lang.Object, disposes of offscreen graphics

Overrides:

finalize in class java.lang.Object